--
-- make_cpp.lua
-- Generate a C/C++ project makefile.
-- Copyright (c) 2002-2013 Jason Perkins and the Premake project
--

	premake.make.cpp = { }
	local cpp = premake.make.cpp
	local make = premake.make


	function premake.make_cpp(prj)
		-- create a shortcut to the compiler interface
		local cc = premake.gettool(prj)

		-- build a list of supported target platforms that also includes a generic build
		local platforms = premake.filterplatforms(prj.solution, cc.platforms, "Native")

		premake.gmake_cpp_header(prj, cc, platforms)

		for _, platform in ipairs(platforms) do
			for cfg in premake.eachconfig(prj, platform) do
				premake.gmake_cpp_config(cfg, cc)
			end
		end

		-- list intermediate files
		_p('OBJECTS := \\')
		for _, file in ipairs(prj.files) do
			if path.iscppfile(file) then
				_p('\t$(OBJDIR)/%s.o \\', _MAKE.esc(path.getbasename(file)))
			end
		end
		_p('')

		_p('RESOURCES := \\')
		for _, file in ipairs(prj.files) do
			if path.isresourcefile(file) then
				_p('\t$(OBJDIR)/%s.res \\', _MAKE.esc(path.getbasename(file)))
			end
		end
		_p('')

		-- identify the shell type
		_p('SHELLTYPE := msdos')
		_p('ifeq (,$(ComSpec)$(COMSPEC))')
		_p('  SHELLTYPE := posix')
		_p('endif')
		_p('ifeq (/bin,$(findstring /bin,$(SHELL)))')
		_p('  SHELLTYPE := posix')
		_p('endif')
		_p('')

		-- main build rule(s)
		_p('.PHONY: clean prebuild prelink')
		_p('')

		if os.is("MacOSX") and prj.kind == "WindowedApp" then
			_p('all: $(TARGETDIR) $(OBJDIR) prebuild prelink $(TARGET) $(dir $(TARGETDIR))PkgInfo $(dir $(TARGETDIR))Info.plist')
		else
			_p('all: $(TARGETDIR) $(OBJDIR) prebuild prelink $(TARGET)')
		end
		_p('\t@:')
		_p('')

		-- target build rule
		_p('$(TARGET): $(GCH) $(OBJECTS) $(LDDEPS) $(RESOURCES)')
		_p('\t@echo Linking %s', prj.name)
		_p('\t$(SILENT) $(LINKCMD)')
		_p('\t$(POSTBUILDCMDS)')
		_p('')

		-- Create destination directories. Can't use $@ for this because it loses the
		-- escaping, causing issues with spaces and parenthesis
		_p('$(TARGETDIR):')
		premake.make_mkdirrule("$(TARGETDIR)")

		_p('$(OBJDIR):')
		premake.make_mkdirrule("$(OBJDIR)")

		-- Mac OS X specific targets
		if os.is("MacOSX") and prj.kind == "WindowedApp" then
			_p('$(dir $(TARGETDIR))PkgInfo:')
			_p('$(dir $(TARGETDIR))Info.plist:')
			_p('')
		end

		-- clean target
		_p('clean:')
		_p('\t@echo Cleaning %s', prj.name)
		_p('ifeq (posix,$(SHELLTYPE))')
		_p('\t$(SILENT) rm -f  $(TARGET)')
		_p('\t$(SILENT) rm -rf $(OBJDIR)')
		_p('else')
		_p('\t$(SILENT) if exist $(subst /,\\\\,$(TARGET)) del $(subst /,\\\\,$(TARGET))')
		_p('\t$(SILENT) if exist $(subst /,\\\\,$(OBJDIR)) rmdir /s /q $(subst /,\\\\,$(OBJDIR))')
		_p('endif')
		_p('')

		-- custom build step targets
		_p('prebuild:')
		_p('\t$(PREBUILDCMDS)')
		_p('')

		_p('prelink:')
		_p('\t$(PRELINKCMDS)')
		_p('')

		-- precompiler header rule
		cpp.pchrules(prj)

		-- per-file build rules
		cpp.fileRules(prj)

		-- include the dependencies, built by GCC (with the -MMD flag)
		_p('-include $(OBJECTS:%%.o=%%.d)')
		_p('ifneq (,$(PCH))')
			_p('  -include $(OBJDIR)/$(notdir $(PCH)).d')
		_p('endif')
	end



--
-- Write the makefile header
--

	function premake.gmake_cpp_header(prj, cc, platforms)
		_p('# %s project makefile autogenerated by Premake', premake.action.current().shortname)

		-- set up the environment
		_p('ifndef config')
		_p('  config=%s', _MAKE.esc(premake.getconfigname(prj.solution.configurations[1], platforms[1], true)))
		_p('endif')
		_p('')

		_p('ifndef verbose')
		_p('  SILENT = @')
		_p('endif')
		_p('')

		_p('CC = %s', cc.cc)
		_p('CXX = %s', cc.cxx)
		_p('AR = %s', cc.ar)
		_p('')

		_p('ifndef RESCOMP')
		_p('  ifdef WINDRES')
		_p('    RESCOMP = $(WINDRES)')
		_p('  else')
		_p('    RESCOMP = windres')
		_p('  endif')
		_p('endif')
		_p('')
	end

--
-- Write a block of configuration settings.
--

	function premake.gmake_cpp_config(cfg, cc)

		_p('ifeq ($(config),%s)', _MAKE.esc(cfg.shortname))

		-- if this platform requires a special compiler or linker, list it here
		cpp.platformtools(cfg, cc)

		_p('  OBJDIR     = %s', _MAKE.esc(cfg.objectsdir))
		_p('  TARGETDIR  = %s', _MAKE.esc(cfg.buildtarget.directory))
		_p('  TARGET     = $(TARGETDIR)/%s', _MAKE.esc(cfg.buildtarget.name))
		_p('  DEFINES   +=%s', make.list(cc.getdefines(cfg.defines)))
		_p('  INCLUDES  +=%s', make.list(cc.getincludedirs(cfg.includedirs)))

		-- set up precompiled headers
		cpp.pchconfig(cfg)

		-- CPPFLAGS, CFLAGS, CXXFLAGS, and RESFLAGS
		cpp.flags(cfg, cc)

		-- write out libraries, linker flags, and the link command
		cpp.linker(cfg, cc)

		_p('  define PREBUILDCMDS')
		if #cfg.prebuildcommands > 0 then
			_p('\t@echo Running pre-build commands')
			_p('\t%s', table.implode(cfg.prebuildcommands, "", "", "\n\t"))
		end
		_p('  endef')

		_p('  define PRELINKCMDS')
		if #cfg.prelinkcommands > 0 then
			_p('\t@echo Running pre-link commands')
			_p('\t%s', table.implode(cfg.prelinkcommands, "", "", "\n\t"))
		end
		_p('  endef')

		_p('  define POSTBUILDCMDS')
		if #cfg.postbuildcommands > 0 then
			_p('\t@echo Running post-build commands')
			_p('\t%s', table.implode(cfg.postbuildcommands, "", "", "\n\t"))
		end
		_p('  endef')

		-- write out config-level makesettings blocks
		make.settings(cfg, cc)

		_p('endif')
		_p('')
	end


--
-- Platform support
--

	function cpp.platformtools(cfg, cc)
		local platform = cc.platforms[cfg.platform]
		if platform.cc then
			_p('  CC         = %s', platform.cc)
		end
		if platform.cxx then
			_p('  CXX        = %s', platform.cxx)
		end
		if platform.ar then
			_p('  AR         = %s', platform.ar)
		end
	end


--
-- Configurations
--

	function cpp.flags(cfg, cc)

		if cfg.pchheader and not cfg.flags.NoPCH then
			_p('  FORCE_INCLUDE += -include $(OBJDIR)/$(notdir $(PCH))')
		end

		_p('  ALL_CPPFLAGS  += $(CPPFLAGS) %s $(DEFINES) $(INCLUDES)', table.concat(cc.getcppflags(cfg), " "))

		_p('  ALL_CFLAGS    += $(CFLAGS) $(ALL_CPPFLAGS)%s', make.list(table.join(cc.getcflags(cfg), cfg.buildoptions)))
		_p('  ALL_CXXFLAGS  += $(CXXFLAGS) $(ALL_CFLAGS)%s', make.list(cc.getcxxflags(cfg)))

		_p('  ALL_RESFLAGS  += $(RESFLAGS) $(DEFINES) $(INCLUDES)%s',
		        make.list(table.join(cc.getdefines(cfg.resdefines),
		                                cc.getincludedirs(cfg.resincludedirs), cfg.resoptions)))
	end


--
-- Linker settings, including the libraries to link, the linker flags,
-- and the linker command.
--

	function cpp.linker(cfg, cc)
		-- Patch #3401184 changed the order
		_p('  ALL_LDFLAGS   += $(LDFLAGS)%s', make.list(table.join(cc.getlibdirflags(cfg), cc.getldflags(cfg), cfg.linkoptions)))

		_p('  LDDEPS    +=%s', make.list(_MAKE.esc(premake.getlinks(cfg, "siblings", "fullpath"))))
		_p('  LIBS      += $(LDDEPS)%s', make.list(cc.getlinkflags(cfg)))

		if cfg.kind == "StaticLib" then
			if cfg.platform:startswith("Universal") then
				_p('  LINKCMD    = libtool -o $(TARGET) $(OBJECTS)')
			else
				_p('  LINKCMD    = $(AR) -rcs $(TARGET) $(OBJECTS)')
			end
		else

			-- this was $(TARGET) $(LDFLAGS) $(OBJECTS)
			--   but had trouble linking to certain static libs; $(OBJECTS) moved up
			-- $(LDFLAGS) moved to end (http://sourceforge.net/p/premake/patches/107/)
			-- $(LIBS) moved to end (http://sourceforge.net/p/premake/bugs/279/)

			local tool = iif(cfg.language == "C", "CC", "CXX")
			_p('  LINKCMD    = $(%s) -o $(TARGET) $(OBJECTS) $(RESOURCES) $(ALL_LDFLAGS) $(LIBS)', tool)

		end
	end


--
-- Precompiled header support
--

	function cpp.pchconfig(cfg)

		-- If there is no header, or if PCH has been disabled, I can early out

		if not cfg.pchheader or cfg.flags.NoPCH then
			return
		end

		-- Visual Studio requires the PCH header to be specified in the same way
		-- it appears in the #include statements used in the source code; the PCH
		-- source actual handles the compilation of the header. GCC compiles the
		-- header file directly, and needs the file's actual file system path in
		-- order to locate it.

		-- To maximize the compatibility between the two approaches, see if I can
		-- locate the specified PCH header on one of the include file search paths
		-- and, if so, adjust the path automatically so the user doesn't have
		-- add a conditional configuration to the project script.

		local pch = cfg.pchheader
		for _, incdir in ipairs(cfg.includedirs) do

			-- convert this back to an absolute path for os.isfile()
			local abspath = path.getabsolute(path.join(cfg.project.location, incdir))

			local testname = path.join(abspath, pch)
			if os.isfile(testname) then
				pch = path.getrelative(cfg.location, testname)
				break
			end
		end

		_p('  PCH        = %s', _MAKE.esc(pch))
		_p('  GCH        = $(OBJDIR)/$(notdir $(PCH)).gch')

	end


	function cpp.pchrules(prj)
		_p('ifneq (,$(PCH))')
		_p('.NOTPARALLEL: $(GCH) $(PCH)')
		_p('$(GCH): $(PCH)')
		_p('\t@echo $(notdir $<)')

		local cmd = iif(prj.language == "C", "$(CC) -x c-header $(ALL_CFLAGS)", "$(CXX) -x c++-header $(ALL_CXXFLAGS)")
		_p('\t$(SILENT) %s -MMD -MP $(DEFINES) $(INCLUDES) -o "$@" -MF "$(@:%%.gch=%%.d)" -c "$<"', cmd)

		_p('endif')
		_p('')
	end


--
-- Build command for a single file.
--

	function cpp.fileRules(prj)
		for _, file in ipairs(prj.files or {}) do
			if path.iscppfile(file) then
				_p('$(OBJDIR)/%s.o: %s', _MAKE.esc(path.getbasename(file)), _MAKE.esc(file))
				_p('\t@echo $(notdir $<)')
				cpp.buildcommand(path.iscfile(file), "o")
				_p('')
			elseif (path.getextension(file) == ".rc") then
				_p('$(OBJDIR)/%s.res: %s', _MAKE.esc(path.getbasename(file)), _MAKE.esc(file))
				_p('\t@echo $(notdir $<)')
				_p('\t$(SILENT) $(RESCOMP) $< -O coff -o "$@" $(ALL_RESFLAGS)')
				_p('')
			end
		end
	end

	function cpp.buildcommand(iscfile, objext)
		local flags = iif(iscfile, '$(CC) $(ALL_CFLAGS)', '$(CXX) $(ALL_CXXFLAGS)')
		_p('\t$(SILENT) %s $(FORCE_INCLUDE) -o "$@" -MF "$(@:%%.%s=%%.d)" -c "$<"', flags, objext)
	end
